A New Measurement of the 6Li(n,{\alpha})t Cross Section at MeV Energies Using a Fission Chamber and 6Li Scintillators

摘要

A new measurement is presented of the $^6$Li(n,$\alpha$)t cross section from245 keV to 10 MeV using a $^{252}$Cf fission chamber with $^6$LiI(Eu) andCs$_2$LiYCl$_6$:Ce (CLYC) scintillators which act as both target and detector.Neutron energies are determined from the time of flight (TOF) method using thesignals from spontaneous fission and reaction product recoil. Simulations ofneutron downscatter in the crystals and fission chamber bring$^6$Li(n,$\alpha$)t cross section values measured with the $^6$LiI(Eu) intoagreement with previous experiments and evaluations, except for two resonancesat 4.2 and 6.5 MeV introduced by ENDF/B-VII.1. Suspected neutron transportmodeling issues cause the cross section values obtained with CLYC to bediscrepant above 2 MeV.